麻烦翻译一下题,然后能否给出用英语回答的答案...
1.Defineeitherkineticenergyorpotentialenergy.
2.what'spowerandwhataretheSIunitsforpower?
3.whatarethefourphasesofmatter?
4.whatisthedensity?
5whatispressure?
6.Ablockslidestotherightonahorizontalfloor.inwhatdirectionistheforceoffrictionexertedbythefloorontheblock?whatisthereactionforce(Newton'sThirdLawpair)tothisforceoffriction?Inwhatdirectionisthereactionforce?
7.thenetforceona5kgblockismeasuredtobe10N.whatistheaccelerationoftheblock?
8.A4kgblockisheadingtowardahead-oncollisionwith2kgblock.Ifthe4kgblockhasaspeedof3m/sjustbeforethecollisionandthe2kgblockisatrest,whatisthespeedofbothblockiftheycollideandsticktogether?